Add [DoNotGenerateClassBindings] extended attribute

Source/bindings/templates/interface.h

 {# http://www.chromium.org/blink/coding-style#TOC-License #}
 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 180 matching lines @@
     friend v8::Handle<v8::Object> wrap(Node*, v8::Handle<v8::Object> creationContext, v8::Isolate*);
     {% endif %}
 
 private:
     {% if not has_custom_to_v8 %}
     friend v8::Handle<v8::Object> wrap({{cpp_class}}*, v8::Handle<v8::Object> creationContext, v8::Isolate*);
     static v8::Handle<v8::Object> createWrapper({{pass_ref_ptr}}<{{cpp_class}}>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
     {% endif %}
 };
 
+{% if has_class_bindings %}
 {% if has_custom_to_v8 %}
 class {{cpp_class}};
 v8::Handle<v8::Value> toV8({{cpp_class}}*, v8::Handle<v8::Object> creationContext, v8::Isolate*);
 
 template<class CallbackInfo>
 inline void v8SetReturnValue(const CallbackInfo& callbackInfo, {{cpp_class}}* impl)
 {
     v8SetReturnValue(callbackInfo, toV8(impl, callbackInfo.Holder(), callbackInfo.GetIsolate()));
 }
 
@@ skipping 91 matching lines @@
 template<class CallbackInfo, class Wrappable>
 inline void v8SetReturnValueFast(const CallbackInfo& callbackInfo, {{pass_ref_ptr}}<{{cpp_class}}> impl, Wrappable* wrappable)
 {
     v8SetReturnValueFast(callbackInfo, impl.get(), wrappable);
 }
 
 {% if has_event_constructor %}
 bool initialize{{cpp_class}}({{cpp_class}}Init&, const Dictionary&, ExceptionState&, const v8::FunctionCallbackInfo<v8::Value>& info, const String& = "");
 
 {% endif %}
+{% endif %}{# has_class_bindings #}
 }
 {% endfilter %}
 #endif // {{v8_class}}_h